315121431 has 8 divisors (see below), whose sum is σ = 420757360. Its totient is φ = 209783232.

The previous prime is 315121399. The next prime is 315121483. The reversal of 315121431 is 134121513.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 315121431 - 2⁵ = 315121399 is a prime.

It is a super-2 number, since 2×315121431² = 198603032550975522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 315121398 and 315121407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315121031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71950 + ... + 76203.

It is an arithmetic number, because the mean of its divisors is an integer number (52594670).

Almost surely, 2^315121431 is an apocalyptic number.

315121431 is a deficient number, since it is larger than the sum of its proper divisors (105635929).

315121431 is a wasteful number, since it uses less digits than its factorization.

315121431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148865.

The product of its digits is 360, while the sum is 21.

The square root of 315121431 is about 17751.6599505511. The cubic root of 315121431 is about 680.4966318666.

Adding to 315121431 its reverse (134121513), we get a palindrome (449242944).

The spelling of 315121431 in words is "three hundred fifteen million, one hundred twenty-one thousand, four hundred thirty-one".